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I wouldn't sweat it. While most dvds are calibrated at reference levels, I'm sure there are ones that have been set differently. I often notice this when playing cd's...they are often recorded at different levels.
Another consideration may be the background noise in your listening room. I typically need to crank up the system a bit during the day to compete with house noise, outside traffic, etc., but turn down the volume when all's quiet at night. You may also have a very live room, with sound slapping around the walls and ceiling, making it difficult to hear dialogue. Some calibrate the center channel 1-2 db above their other speaker levels.
Dynamic range also varies among movies. Dynamic range is the difference in volume between the quiet passages and loud thundering explosions in a movie. Many dvd player and receivers allow you to minimize the dynamic range. Some call this a "night time" setting.
I do recommend a Radio Shack sound level meter. You don't need to spend extra on the digital model. I think the analog is about $35.00. Also, spend time setting the speaker distances / delays on your receiver.
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